Stable trifluorostyrene containing compounds grafted to base polymers, and their use as polymer electrolyte membranes

Patent · Tue Nov 09 00:00:00 EST 2010

OSTI ID:1014933

Yang, Zhen-Yu ^[1]; Roelofs, Mark Gerrit ^[1]

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1. Hockessin, DE

A fluorinated ion exchange polymer prepared by grafting at least one grafting monomer on to at least one base polymer, wherein the grafting monomer comprises structure 1a or 1b: wherein Z comprises S, SO.sub.2, or POR wherein R comprises a linear or branched perfluoroalkyl group of 1 to 14 carbon atoms optionally containing oxygen or chlorine, an alkyl group of 1 to 8 carbon atoms, an aryl group of 6 to 12 carbon atoms or a substituted aryl group of 6 to 12 carbon atoms; RF comprises a linear or branched perfluoroalkene group of 1 to 20 carbon atoms, optionally containing oxygen or chlorine; Q is chosen from F, --OM, NH.sub.2, --N(M)SO.sub.2R.sup.2.sub.F, and C(M)(SO.sub.2R.sup.2.sub.F).sub.2, wherein M comprises H, an alkali cation, or ammonium; R.sup.2.sub.F groups comprises alkyl of 1 to 14 carbon atoms which may optionally include ether oxygens or aryl of 6 to 12 carbon atoms where the alkyl or aryl groups may be perfluorinated or partially fluorinated; and n is 1 or 2 for 1a, and n is 1, 2, or 3 for 1b. These ion exchange polymers are useful in preparing catalyst coated membranes and membrane electrode assemblies used in fuel cells.

• Research Organization: E.I. du Pont de Nemours and Company (Wilmington, DE)
• Sponsoring Organization: USDOE
• DOE Contract Number: FC04-02AL67606
• Assignee: E.I. du Pont de Nemours and Company (Wilmington, DE)
• Patent Number(s): 7,829,603
• Application Number: US Patent Application 11/547,239
• OSTI ID: 1014933
• Country of Publication: United States
• Language: English